import java.sql.*;

public class Main {
    public static void main(String[] args) {
        Connection root = null;
        PreparedStatement preparedStatement = null;
        ResultSet resultSet = null;
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            //创建连接
            String url="jdbc:mysql://127.0.0.1:3306/jdbc?characterEncoding=utf-8";
            root = DriverManager.getConnection(url, "root", "050214");
            //if(root!=null){
             //   System.out.println("连接成功");
            //}
            //3.执行sql
            String sql="SELECT*FROM user" ;
             preparedStatement = root.prepareStatement(sql);
            resultSet = preparedStatement.executeQuery();
            while(resultSet.next()){
                int id = resultSet.getInt(1);
                String name = resultSet.getString(2);
                String pass = resultSet.getString(3);
                System.out.println(id+"------"+name+"-----"+pass);
            }



        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }finally {
            try {
                if(resultSet !=null){
                    resultSet.close();}
                if(preparedStatement !=null){
                    preparedStatement.close();}
                if(root !=null){
                    root.close();}
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }

        }
    }
}
//写个99乘法表

